Muffler device

Abstract

A lightweight and compact muffler device that can be installed in a limited space in an inside of a generator. A top cover and an undercover (end cover) provided on a top and a bottom of a vertically disposed casing are each formed in substantially trapezoidal shape. Thereby, an inner capacity of the casing can be secured to be large, as a result of which, a size of the muffler device can be made compact, and no extra component is required, so that reduction in manufacturing cost and reduction in weight can be achieved. Since the casing is disposed vertically, it is possible to install the casing even when an installation space is small in an inside of a housing of a generator, and it is possible to make the generator compact.

The invention claimed is: 
     
       1. A muffler device of a portable generator, comprising:
 a casing disposed vertically, wherein end covers provided on a top and a bottom of the casing are each formed in a substantially trapezoidal shape, 
 the end covers are formed of a top cover provided at an upper portion of the casing, and an undercover provided at a lower portion of the casing, an inclined surface is formed on a top surface of the top cover, and an exhaust pipe and a tail pipe are connected to the inclined surface of the top cover, and 
 the muffler device comprising a catalyst device in an inside of the casing, wherein 
 a diffuser pipe is disposed between a connection portion of the top cover to the exhaust pipe and a placement position of the catalyst device, in the inside of the casing, 
 an exhaust hole connecting the exhaust pipe is formed in the inclined surface, 
 the catalyst device includes an inflow hole through which the exhaust gas flows into the catalyst device, 
 the muffler device comprises a path in which the exhaust gas flows from the exhaust hole to the inflow hole of the catalyst device, 
 in the path, the diffuser pipe is disposed between the exhaust hole and the inflow hole of the catalyst device, 
 a first partition wall and a second partition wall that are disposed with a predetermined space in an up-down direction are provided in an inside of the casing, the inside of the casing is partitioned into a first chamber at an upper side, a second chamber at an intermediate part, and a third chamber at a lower side by the first partition wall and the second partition wall, the first chamber communicates with the exhaust hole, the second partition wall is provided with a communication hole that allows the second chamber and the third chamber to communicate with each other, 
 the catalyst device penetrates through the first partition wall and protrudes upward from the first partition wall, the inflow hole of the catalyst device opens to the first chamber, the catalyst device further includes an outflow hole which opens to the second chamber and through which the exhaust gas flows out of the catalyst device. 
 
     
     
       2. The muffler device according to  claim 1 , wherein
 the catalyst device is disposed such that a longitudinal direction of the catalyst device is in a vertical direction. 
 
     
     
       3. The muffler device according to  claim 2 , wherein
 the diffuser pipe extends over a substantially entire region in an up-down direction of the casing, and an arrester is disposed in a connection portion of the diffuser pipe to the tail pipe. 
 
     
     
       4. The muffler device according to  claim 1 , wherein
 the diffuser pipe extends over a substantially entire region in an up-down direction of the casing, and an arrester is disposed in a connection portion of the diffuser pipe to the tail pipe. 
 
     
     
       5. The muffler device according to  claim 4 , wherein
 the diffuser pipe includes a connection pipe connected to the tail pipe hole, and the arrester is disposed inside of the connection pipe. 
 
     
     
       6. The muffler device according to  claim 1 , wherein
 the diffuser pipe extends to penetrate through the first partition wall and the second partition wall and protrudes downward from the second partition wall, and the diffuser pipe includes a lower end which is located inside the third chamber and through which the exhaust gas flows into an inside of the diffuser pipe.